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In 1864, the area was surveyed and the geographic township of Saint-Denis was created. The Mission of Saint-Denis was founded in 1916, but real growth came in the 1920s, during the period of colonization of the Chic-Chocs plateau. For unknown reasons, the place, that was originally known as Saint-Denis, came to be called Saint-Adelme.
In 1933, its post office opened. On September 9 that same year, the Parish Municipality of Saint-Adelme was formed out of territory ceded by the Parish Municipalities of Saint-Jérôme-de-Matane and Sainte-Félicité, as well as some previously unorganized territory.
Demographics
In the 2021 Census of Population conducted by Statistics Canada, Saint-Adelme had a population of 484 living in 223 of its 291 total private dwellings, a change of -6.9% from its 2016 population of 520. With a land area of 100.58 km (38.83 sq mi), it had a population density of 4.8/km (12.5/sq mi) in 2021.
"1971 Census of Canada - Population Census Subdivisions (Historical)". Catalogue 92-702 Vol I, part 1 (Bulletin 1.1-2). Statistics Canada: 76, 139. July 1973.